Tool-guide for grindstones.



Patented sept. as, |902. s. c. sc HoHELu. TooL sums Fun GmNn'stoNEs;

(Appl'iction led Jan. 3Q, 1902.) (No Model.)

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NUNITED STATES PATENT OFFICE.

SILAS C. SCHOFIELD, OF FREEPORT, ILLINOIS.

TOOL-GUIDE FOR GRINDSTONES.

SPECIFICATION forming' part of Letters Patent No. |709,177, dated September 16, 192.

Application iled January SO, 1902. Serial No. 91,833. (No model.)

To, (1f/,7, .11th/mrt t r11/ty concern:

Be it known that I, SILAs C. SCHOEIELD, a citizen of the United States of America, residing at Freeport, in the county of Stephenson and State of Illinois, have invented certain newand useful Improvements in 'Fool-Guides for Grindstones, of which the following is a specification.

` My invention relates to certain neu7 and useful improvements in tool-guides for grindstones, the object of which is to produce a guide which can be readily adjusted in any desired position and which will hold in place objects of varying shapes and sizes at any desired angle. Great adjustment is necessary in this class of guides, for the reason that in the ordinary use of grindstones the guide musthandleaxes and like heavy tools, knives of Varying thickness, all of which are ground tangentially with respect to the grindstones, and also scissors, which are ground approximately radially with respect to the grindstone. My improved guide is adapted to meet these varying conditions; and to these ends my invention relates to certain novel features of construction, which are shown inV the accompanying drawings and'which will be fully described in the specification.

In the drawings, Figure] is a perspective of" an emery-wheel, showing myimproved guide in the position for grinding knives. Fig. 2 is a top plan of the same in the same position. Fig. 3 is a perspectiveof the guide proper separated from the supporting device.

Referring to the drawings, A is an emerywheel mounted upon a shaft B, which is rotatably journaled in boxes b b'. The boxes h b are secured by means of bolts b2 to upright arms c c', which are supported upon a base C. The base C is provided with a slot c2, as shown in Fig. 2. Upon this base rests a plate D, provided Witha slot CZ, running longitudinally of said plate, through which slot passes a bolt d', adjustably clamping the plate D to the base C. At the extremity of the plate D farthest removed from the slot cl is a post D, supported in a boss d2 upon the plate D and vertically adjustable therein. This post D is flattened atits upper end and perforated to receive a clamping-bolt d3. The boss d2 and post D form together a telescoping arm, which term is applied to the `(Shown separately in Fig. 3.)

structure in the claims. To the upper end of the post D is secured the guide proper, E. This guide consists of a plate e, having a lng e' projectingbackward from it. the luge' being notched, as shown in Fig. The plate e has upon its front surface two other projecting lugs e2, which are separated by a space slightly greater than the thickness of the emery-wheel A. The lugs e2 also project aslight distance downward, so that if the face e is radially placed with respect to the emery-wheel they can still project slightly beyond the periphery of the wheel. The guide proper, E, is clamped to the post D', as shown in Fig. 1, and can beheld by means of the bolt d3 in any position With respect to the Wheel A, its angular position being changed by turningit upon the clamping-bolt and its radial position by sliding the notch upon the bolt.

The various adjustments described above Willobviously permit the guide E to be placed in any position Whatever with reference to the emery-wheel A. In grinding knives and like light objects the position shown in Fig. l is the most desirable. In grinding axes and heavy tools of that character the guide E is kept in the same angular position With reference to the upright standard, but is moved farther away fromthe emery-Wheel in order to permit the entrance of the larger tool. In grinding scissors, Scrapers, and other tools in which the ground edge is approximately at right angles to the surface of the tool the guide E is moved so that the surface c extends radially from the periphery of the wheel, the lower ends of the lugs e2 extending slightly from the periphery.k The scissors blade or scraper is then placed upon the guide, which will keep the surfaces at right angles to the Wheel.

It may be that for Various purposes it will be desirable to use other positions of the toolguide; but any desired position of the guide can be readily secured by means of the various adjustments shown.

I claim as new and desire to secure by Letters Patent- 1. In a device of the class described, the combination with a suitable supporting-arm, of a guide consisting of a fiat plate supported by said arm, means for angularly adjust- IOO ing said fiat plate upon said arm, and means for altering the position of said guide in all directions, substantially as described.

2. In a device of the class described, the combination with a suitable supporting-arm, of a guide consisting of a llat plate, two forwardly-projecting lugs upon the edges of said plate and means for adjusting the position of said guide, substantially as described.

3. In a device of the class described, the combination with a slotted base and a grindstone rotatably journaled above the same, of a slotted plate upon said base, a bolt passing through the slotsin said plate and said base, an arm extending upward from said plate, a flattened upper portion to said arm, a guide having a notched rearwardly-extending lug, and a`suitable clamping-bolt passing through said flattened portion and said notch and adapted to hold said guide in any desired position with reference to said arm; substan-A tially as described.

4. In a device of the class described, the combination with a suitable supporting-arm, of a guide consisting of a flat plate, a notched rearwardly-extending lug and two forwardlyprojecting lugs upon the edges of said Hattenedplate, said lugs also forming semicireular projections from one end of said flattened plate and suitable means for adjustably supporting said guide upon said supporting-arm;

substantially as described.

'as described.

6. In a device of the class described, the combination with a suitable supporting-arm, of a guide consisting of a dat plate, two forwardly-projecting lugs upon the edges of said plate, means for angularly adjusting said guide upon said arm, and means for permitting said guide to be moved in all directions, substantially as described. I

In witness whereof I have hereunto set my hand, at Freeport, in the county of Stephenson and State of Illinois, this 25th dayof January, A. D. 1902.

SILAS C. SGHOFIELD. \Vitnesses: JAMES II. STEARNS,

OSCAR R. ZIP'F. 

